AQA GCSE CHEMISTRY PAPER 1 (TRIPLE) EXAM 2025
UPDATE/PRACTICE QUESTIONS AND WELL DETAILED
ANSWERS (COMPLETE SOLUTIONS) || GRADED A+||
LATEST UPDATE 2026/27
What is the charge of a proton? -CORRECTANSWER +1
What is the charge of a neutron? -CORRECTANSWER 0
What is the charge of an electron? -CORRECTANSWER -1
What is the relative mass of a proton? -CORRECTANSWER 1
What is the relative mass of a neutron? -CORRECTANSWER 1
What is the relative mass of an electron? -CORRECTANSWER Very small
How many types of atoms do elements contain? -CORRECTANSWER Only one type
What are compounds? -CORRECTANSWER Substances containing two or more
different elements that are chemically bonded together
,What are mixtures? -CORRECTANSWER Substances containing two or more different
elements that are not chemically bonded together
What pattern is formed from carrying out paper chromatography? -CORRECTANSWER
Chromatogram
Which method of separation is useful to separate an insoluble solid from a liquid? -
CORRECTANSWER Filtration
Which method of separation is useful to separate a soluble solid from a liquid? -
CORRECTANSWER Evaporation or Crystillisation
Which method of distillation separates liquids with similar boiling points? -
CORRECTANSWER Fractional distillation
Who discovered that the plum pudding model was wrong? -CORRECTANSWER Ernest
Rutherford
Who devised an experiment that proved the existence of the neutron? -
CORRECTANSWER Niels Bohr
Why did Mendeleev leave gaps in his Table of Elements? -CORRECTANSWER To
ensure that elements with similar properties stayed in the same groups. The gaps
,indicated the existence of undiscovered elements and allowed Mendeleev to predict
what their properties might be
How are the group number and the number of electrons in the outer shell of an element
related? -CORRECTANSWER The group number tells you how many electrons are in
the outer shell of an element. E.g. sodium is in Group 1 therefore it has 1 electron on its
outer shell
What kind of ions do metals form? -CORRECTANSWER Positive
Where are the non-metals on the periodic table? -CORRECTANSWER On the right
hand side
Give three properties which are specific to transition metals -CORRECTANSWER 1)
They can form more than one ion e.g cobalt form Co2+
2) They are often coloured, therefore compounds which contain them are colourful e.g.
potassium chromate is yellow
3) They often make good catalysts e.g. nickel based catalysts are used in the
hydrogenation of alkenes
State three trends as you go down Group 1 -CORRECTANSWER 1) Increased
reactivity - the outer electron is more easily lost as the attraction between the nucleus
and the electron decreases because the electron is further away from the nucleus
, 2) Lower melting and boiling points
3) Higher relative atomic mass
What are the products of the reaction of a Group 1 metal and water -
CORRECTANSWER Hydrogen gas and a metal hydroxide
E.g. sodium + water --> sodium hydroxide + hydrogen
What's the difference between the hardness of Group 1 and transition metals? -
CORRECTANSWER Transition metals are harder, denser and stronger than Group 1
metals
What's the difference between the reactivity of Group 1 and transition metals? -
CORRECTANSWER Group 1 metals are much more reactive than transition metals
What's the difference between the melting points of Group 1 and transition metals? -
CORRECTANSWER Transition metals have higher melting points than Group 1 metals
What trends occur as you go down Group 7? -CORRECTANSWER 1) They become
less reactive - it's harder to gain an extra electron because the outer shell's further from
the nucleus
2) They have higher melting and boiling points
3) They have higher relative atomic masses
UPDATE/PRACTICE QUESTIONS AND WELL DETAILED
ANSWERS (COMPLETE SOLUTIONS) || GRADED A+||
LATEST UPDATE 2026/27
What is the charge of a proton? -CORRECTANSWER +1
What is the charge of a neutron? -CORRECTANSWER 0
What is the charge of an electron? -CORRECTANSWER -1
What is the relative mass of a proton? -CORRECTANSWER 1
What is the relative mass of a neutron? -CORRECTANSWER 1
What is the relative mass of an electron? -CORRECTANSWER Very small
How many types of atoms do elements contain? -CORRECTANSWER Only one type
What are compounds? -CORRECTANSWER Substances containing two or more
different elements that are chemically bonded together
,What are mixtures? -CORRECTANSWER Substances containing two or more different
elements that are not chemically bonded together
What pattern is formed from carrying out paper chromatography? -CORRECTANSWER
Chromatogram
Which method of separation is useful to separate an insoluble solid from a liquid? -
CORRECTANSWER Filtration
Which method of separation is useful to separate a soluble solid from a liquid? -
CORRECTANSWER Evaporation or Crystillisation
Which method of distillation separates liquids with similar boiling points? -
CORRECTANSWER Fractional distillation
Who discovered that the plum pudding model was wrong? -CORRECTANSWER Ernest
Rutherford
Who devised an experiment that proved the existence of the neutron? -
CORRECTANSWER Niels Bohr
Why did Mendeleev leave gaps in his Table of Elements? -CORRECTANSWER To
ensure that elements with similar properties stayed in the same groups. The gaps
,indicated the existence of undiscovered elements and allowed Mendeleev to predict
what their properties might be
How are the group number and the number of electrons in the outer shell of an element
related? -CORRECTANSWER The group number tells you how many electrons are in
the outer shell of an element. E.g. sodium is in Group 1 therefore it has 1 electron on its
outer shell
What kind of ions do metals form? -CORRECTANSWER Positive
Where are the non-metals on the periodic table? -CORRECTANSWER On the right
hand side
Give three properties which are specific to transition metals -CORRECTANSWER 1)
They can form more than one ion e.g cobalt form Co2+
2) They are often coloured, therefore compounds which contain them are colourful e.g.
potassium chromate is yellow
3) They often make good catalysts e.g. nickel based catalysts are used in the
hydrogenation of alkenes
State three trends as you go down Group 1 -CORRECTANSWER 1) Increased
reactivity - the outer electron is more easily lost as the attraction between the nucleus
and the electron decreases because the electron is further away from the nucleus
, 2) Lower melting and boiling points
3) Higher relative atomic mass
What are the products of the reaction of a Group 1 metal and water -
CORRECTANSWER Hydrogen gas and a metal hydroxide
E.g. sodium + water --> sodium hydroxide + hydrogen
What's the difference between the hardness of Group 1 and transition metals? -
CORRECTANSWER Transition metals are harder, denser and stronger than Group 1
metals
What's the difference between the reactivity of Group 1 and transition metals? -
CORRECTANSWER Group 1 metals are much more reactive than transition metals
What's the difference between the melting points of Group 1 and transition metals? -
CORRECTANSWER Transition metals have higher melting points than Group 1 metals
What trends occur as you go down Group 7? -CORRECTANSWER 1) They become
less reactive - it's harder to gain an extra electron because the outer shell's further from
the nucleus
2) They have higher melting and boiling points
3) They have higher relative atomic masses
